package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return  Result.fail("手机号格式错误!");
        }
        String code = RandomUtil.randomNumbers(6);

//        session.setAttribute("code",code);
        // 保存验证码到redis set key=login:code:phone value=code expire=2
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 发送短信验证码
        log.debug("发送短信验证码成功，验证码：{}", code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误!");
        }
        //从redis获取验证码并校验
//        Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            return Result.fail("验证码错误");
        }
        // 查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();
        if (user == null) {
            // 用户不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        // 保存用户信息到redis
        //生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
//        TokenHolder.saveToken(token);
        // 将user对象转换为Hash
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        //设置有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);
//        session.setAttribute("user",userDTO);
        return Result.ok(token);
    }

    @Override
    public Result logout(HttpServletRequest request) {
        String token = request.getHeader("authorization");
        String name = UserHolder.getUser().getNickName();
        if (StrUtil.isBlank(token)){
            return Result.fail("用户未登录");
        }
        Boolean deleted = stringRedisTemplate.delete(LOGIN_USER_KEY + token);
        if (Boolean.TRUE.equals(deleted)){
            log.info("用户:{}   退出登录!",name);
            UserHolder.removeUser();
            return Result.ok("登出成功！");
        }
        return Result.fail("登出失败");
    }

    @Override
    public Result sign() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接日期
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //写入redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接日期
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result == null|| result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num == null||num == 0){
            return Result.ok(0);
        }
        int count = 0;
        while(true){
            if ((num&1) == 0) {
                break;
            }else {
                count++;
            }
            num>>>=1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
